#include <bits/stdc++.h>

using namespace std;

ifstream fin("distante.in");
ofstream fout("distante.out");

int T;
int n, m, s;
bool ok;
int a[50005];

int main()
{
    fin >> T;
    int x, y, c;
    for(int q = 1; q <= T; q ++)
    {
        ok = 1;
        fin >> n >> m >> s;

        for(int i = 1; i <= n; i++)
            fin >> a[i];

        if(a[s] != 0)ok = 0;
        else
            for(int i = 1; i <= m; i++)
            {
                fin >> x >> y >> c;
                if(abs(a[x] - a[y]) > c)
                    ok = 0;
            }
        if(ok == 0)fout << "NU\n";
        else fout << "DA\n";
    }
    return 0;
}